scholarly journals Visually guided unimanual and bimanual reaching rely on different cognitive mechanisms: Evidence from optic ataxia

2018 ◽  
Vol 18 (10) ◽  
pp. 69
Author(s):  
Celia Litovsky ◽  
Feitong Yang ◽  
Zheng Ma ◽  
Jonathan Flombaum ◽  
Michael McCloskey
Keyword(s):  
Visually Guided ◽  
Cognitive Mechanisms ◽  
Optic Ataxia ◽  
Bimanual Reaching

scholarly journals Cortical Control of Visually Guided Reaching: Evidence from Patients with Optic Ataxia

2005 ◽  
Vol 15 (10) ◽  
pp. 1561-1569 ◽  
Author(s):  
Hans-Otto Karnath ◽  
Marie-Thérèse Perenin
Keyword(s):  
Visually Guided ◽  
Cortical Control ◽  
Optic Ataxia ◽  
Visually Guided Reaching

scholarly journals When Mechanical Computations Explain Better

2021 ◽  
pp. 463-477
Author(s):  
Silvano Zipoli Caiani
Keyword(s):  
Dynamical System ◽  
System Theory ◽  
Environmental Variables ◽  
Epistemic Value ◽  
Dynamical System Theory ◽  
Visually Guided ◽  
Optic Ataxia ◽  
Internal Representations ◽  
Visually Guided Reaching ◽  
Computational Explanation

AbstractIn this paper I defend the epistemic value of the representational-computational view of cognition by arguing that it has explanatory merits that cannot be ignored. To this end, I focus on the virtue of a computational explanation of optic ataxia, a disorder characterized by difficulties in executing visually-guided reaching tasks, although ataxic patients do not exhibit any specific disease of the muscular apparatus. I argue that addressing cases of patients who are suffering from optic ataxia by invoking a causal role for internal representations is more effective than merely relying on correlations between bodily and environmental variables. This argument has consequences for the epistemic assessment of radical enactivism, whichRE invokes the Dynamical System Theory as the best tool for explaining cognitive phenomena.

scholarly journals Occurrence of Balínt Syndrome in a Patient with Hypereosinophilic Syndrome

2020 ◽  
Author(s):  
Philipp Klocke ◽  
Anna Whalen-Browne ◽  
Elliot Hepworth ◽  
Mohamed Panju
Keyword(s):  
Growth Factor ◽  
Hypereosinophilic Syndrome ◽  
Growth Factor Receptor ◽  
Platelet Derived Growth Factor ◽  
Ocular Motor ◽  
Visually Guided ◽  
Optic Ataxia ◽  
First Case ◽  
Motor Apraxia ◽  
Voluntary Saccades

Balínt Syndrome is an acquired disorder manifesting in the inability to recognize several objects at once (simultagnosia), inaccurate visually guided limb movements despite intact motor function (optic ataxia) and the inability to make accurate voluntary saccades to visual targets despite demonstrating unrestricted range of eye movements (ocular motor apraxia). Here we report the first case of a patient presenting with Balínt Syndrome caused by a platelet-derived growth factor receptor A mutation (PDGFRA)-induced Hypereosinophilic Syndrome (HES).

Bimanual visually guided movements are more than the sum of their parts: Evidence from optic ataxia

2019 ◽  
Vol 36 (7-8) ◽  
pp. 410-420
Author(s):  
Celia Litovsky ◽  
Feitong Yang ◽  
Jonathan Flombaum ◽  
Michael McCloskey
Keyword(s):  
Visually Guided ◽  
Optic Ataxia ◽  
Visually Guided Movements

scholarly journals Movement order and saccade direction affect a common measure of eye-hand coordination in bimanual reaching

2014 ◽  
Vol 112 (3) ◽  
pp. 730-739 ◽  
Author(s):  
Eric Mooshagian ◽  
Cunguo Wang ◽  
Afreen Ferdoash ◽  
Lawrence H. Snyder
Keyword(s):  
Reaction Times ◽  
Visually Guided ◽  
Average Correlation ◽  
Single Target ◽  
Two Factors ◽  
Saccade Direction ◽  
Hand Coordination ◽  
Correlation Strength ◽  
Highly Correlated ◽  
Bimanual Reaching

Studies of visually guided unimanual reaching have established that a saccade usually precedes each reach and that the reaction times (RTs) for the saccade and reach are highly correlated. The correlation of eye and hand RT is commonly taken as a measure of eye-hand coordination and is thought to assist visuospatial guidance of the hand. We asked what happens during a bimanual reach task. As with a unimanual reach, a saccade was executed first. Although latencies were fastest on unimanual trials, eye and hand RT correlation was identical whether just one or both hands reached to a single target. The average correlation was significantly reduced, however, when each hand reached simultaneously to a different target. We considered three factors that might explain the drop. We found that correlation strength depended on which hand reached first and on which hand reached to the same target as the saccade. Surprisingly, these two factors were largely independent, and the identity of the hand, left or right, had little effect. Eye-hand correlation was similar to that seen with unimanual reaching only when the hand that moved to the same target as the saccade was also the first hand to move. Thus both timing as well as spatial pattern are important in determining eye-hand coordination.

scholarly journals Decoupled Visually-Guided Reaching in Optic Ataxia: Differences in Motor Control between Canonical and Non-Canonical Orientations in Space

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e86138 ◽  
Author(s):  
Joshua A. Granek ◽  
Laure Pisella ◽  
John Stemberger ◽  
Alain Vighetto ◽  
Yves Rossetti ◽  
...  
Keyword(s):  
Motor Control ◽  
Visually Guided ◽  
Optic Ataxia ◽  
Visually Guided Reaching

The bottleneck may be the solution, not the problem

2016 ◽  
Vol 39 ◽  
Author(s):  
Arnon Lotem ◽  
Oren Kolodny ◽  
Joseph Y. Halpern ◽  
Luca Onnis ◽  
Shimon Edelman
Keyword(s):  
Working Memory ◽  
Language Acquisition ◽  
Recent Theory ◽  
Cognitive Mechanisms ◽  
Selection Pressures ◽  
Biological Trait ◽  
Memory Bottleneck

AbstractAs a highly consequential biological trait, a memory “bottleneck” cannot escape selection pressures. It must therefore co-evolve with other cognitive mechanisms rather than act as an independent constraint. Recent theory and an implemented model of language acquisition suggest that a limit on working memory may evolve to help learning. Furthermore, it need not hamper the use of language for communication.

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